RFR: 8371194: serviceability/sa/TestJhsdbJstackMixedWithXComp.java failing [v2]

[Chris Plummer]

On Thu, 13 Nov 2025 12:53:50 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> We've fixed mixed mode jstack for the debuggee running with `-Xcomp` in [JDK-8370176](https://bugs.openjdk.org/browse/JDK-8370176), but it was not enough. We need to handle like unifying `CFrame` and `Frame` in stack unwinding as possible, and need to change how to get caller SP/FP from stack.
>> 
>> This PR works fine on both Linux AMD64 and Linux AArch64. All of `hotspot/jtreg/serviceability/sa` tests have been passed on both platforms.
>> 
>> Big thanks to @pchilano for your help!
>
> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update for Linux PPC64 and RISC-V

stderr: [Exception in thread "main" java.lang.RuntimeException: VM.initialize() was not yet called
	at jdk.hotspot.agent/sun.jvm.hotspot.runtime.VM.getVM(VM.java:576)
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.generateJavaThreadList(BsdDebuggerLocal.java:248)
	at jdk.hotspot.agent/sun.jvm.hotspot.debugger.bsd.BsdDebuggerLocal.attach(BsdDebuggerLocal.java:285)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:638)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupDebuggerDarwin(HotSpotAgent.java:624)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:378)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:343)
	at jdk.hotspot.agent/sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:157)
	at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.attachDebugger(CLHSDB.java:211)
	at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:70)
	at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:45)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:285)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:507)


VM.initialize() is not triggered until after HotSpotAgent.setupDebugger() returns:


    private void go() {
        setupDebugger();
        setupVM();
    }

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PR Comment: https://git.openjdk.org/jdk/pull/28284#issuecomment-3554527760